The symptoms you describe (completely inadequately if you want helpful advice rather than vague speculation) are probably quite normal for an "always on" connection without a basic firewall. It's unlikely that you have been "hacked", though it's not unlikely that programs you have installed are doing things that you don't know about (a lot of them "call home", reporting statistics, checking for updates and the like, unless you disable those functions). Other than that, the most common cause of unexpected behaviour is the result of malicious scripting picked up from porn or "warez" sites.

You'd be better off asking your question properly at a technical support forum rather than one dedicated to music, but those places would give you short shrift for wasting their time if you couched it in the impossibly imprecise terms you've used so far.